1. Bright points of sunlight that briefly appear around the moon immediately before and after a total eclipse of the sun which are caused by sunlight shining through valleys on the moon.
2. A chain of several bright "beads" of white light, visible just before or after totality at a solar eclipse.

The effect occurs when bits of photosphere shine through valleys at the moon's edge.

Named after Francis Baily (1774-1844), a British astronomer.